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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab79f23c1704613080b59048cc5d3f36cb51d9e091395e15c2640c259694b42' 
  AND token = 'jQmXgE/fNMQne7AKAcy5gakFiM7urj+nLzDYAsJWvh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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