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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d723fa2c7d20dc872f9bd8ab47b08024f9fab71cd2675ec6736e5888ac5083' 
  AND token = '47Cm5+H7rgyNRH5TB4qjCocaSNLy5ixTftU82bYIpAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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