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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edfde12e1b8bbe9f0209a6f3e7b35ea47bef545457b7ca7e1e5d6e099febd95b' 
  AND token = 'VHUqEFnLFvcYJWKF8ZY5eIaX6Tqum6N9K+yXozAN5vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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