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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50aa74afa0816631f7d9a58cd4cad9d99675f52c5a0bc08d3d3b4602684852e9' 
  AND token = 'undUMTjfS4T3efaa6QXmOYZ71LcqvTrDwhcJ8rBu08I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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