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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a541eedb54c06c02c5810cdee3b4d429cf3cc4c884ba24bf6d078657f54b85c8' 
  AND token = '2GJXRvUIwhLcQ2Sn2o8Ps43jv/dBzfOm4P0r2UNjxIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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