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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a519a838e7e10c868752fa26c5d0a2a4f27e2c41693aea33abb8a481ee60eb' 
  AND token = 'w5L7BMYsk2z6Oon2DZcuSTLiCopMM4Ph0QFjF002v34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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