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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d195ea34ef3e71939ae670b5e1745790abcb319481ee9b2f40d37d1cd7a4da9' 
  AND token = 'GOJk5YGxqtaxyXVQs73X4aNMiHcqyBglBaNY4P6WeZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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