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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef09a3c3a122023f8a0a1019f6610ded7b173301c10db72d55f9820ecaeccd2b' 
  AND token = 'hdUuE2G0T9/mNil6MavdScv4jwCC9NUu/g2u+sjS+do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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