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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3310e6b9477cf1608c26f8d5de568cc42cefaa570102b0b54ac15622e5b85dd3' 
  AND token = 'UnVpco6I0+gHrRDvqP0A/aKnJOpQD5OuRufaO/Tz6o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}