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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a15eaa0192ae2b8c60d76c1c78982f48744068f0ac676bc8d166a28a59b43c9a' 
  AND token = 'QX91Lb04szwP3khkG1G1b9SDAzw6D6rJKY1r0+qhE6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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