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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e4b19bee4298ce9a882355524316635b703a53d621be4f65f4f56c5907ac0c' 
  AND token = '1VR8dGkHBBIczBcRxVkooqcZ4okfxP9I8phuVLN17X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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