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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb252e4c1e1396c289e32b2619966f9a23c32f951c182bbc213a2356a6f163c8' 
  AND token = 'zlMp0QutH2JioOQC6m1R43Cuk0+hc+U9DLjkEnpGWFg=' 
  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"
    }
  }
}