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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315d4e5d293372fad900402cf9bf052f1c94e96bb41202d51bd13ac20218e069' 
  AND token = 'AqQyWZqCza33nH6SKHhQ7tST2KkEaCMwL2FRHZVBR8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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