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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d009fbbe1a6f4bb3b191d363bc1ecb314a92d7c130041fa18e6eceacded88cf' 
  AND token = 'BG7o1iH396L0oQCl6FYHfxKk8+69d2PZ6ZfR+nzYcr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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