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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d9caf4f805626486f09ebb22e68fc896933a6f58670d6c91fe50729de74072' 
  AND token = 'KOHrHvx2BAm/u2gF7nD0SGTAeTrr9te7VBxvCS0yOQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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