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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '589d008f0e0d4e426fecbb4c5b87bf302e88d120ffeab6f1166a13853bc8cdaf' 
  AND token = '0zSu8tniBJYqMb/Y5aGhLwcTgaa3k9Ns9bh0JRpg65I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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