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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b9c5a35a1a417cd3fb4d2423757dd94c65ed3c2a1bd482fd61359ad544ddba' 
  AND token = '2BERfmcCrEWTrj4ju3ASnYDhLQOoz5PRAiLeVAegVL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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