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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089e53d92fb3179d0b06db63252122ced9a1f0d33c81d2a3a38a17d0b37b4f29' 
  AND token = 'U+Ru4bk5ivjNuOH5FzqoAuW4P5T3uKON87rdMm7v0qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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