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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e4c96131dcff19a6118e8840767b48d8e5e2b815b2d39698b68434a65021df5' 
  AND token = 'SdCGauSRo5O92V6LSS34a0zQfeZmMWNFp8Zmc5KG2O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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