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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4a4fd6650aca6a6569736274ec6d4ef163a0c9e74ac7d1148088029199c067' 
  AND token = 'zGGcQAkiMClLiqDrk1cYjdvrHTr4TR8E5EVwh9ZBw0w=' 
  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"
    }
  }
}