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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4538b7a17b1dc2c897dbf1cf6998a8d287e2ca3d32be5da4885692c1571e715' 
  AND token = 'OCuXbk25v4KdzL3y/mGq8TV/Yo4TxRKehAxqprrPHuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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