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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49816e2e9601a3c9b0d14cd6b654604fb7f77c65753ed27e60026dcf055434a5' 
  AND token = 'RHfKSc7pCqK5fZ0hA7jeU1faWSFFzFHmKTJidCXTY+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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