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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10f9cc46095729b31a82a36bb50bd8612816a2003e3776e4c53e01b530256de' 
  AND token = '7XsZnIk4M38o5/Bs2zkjndglaDG1LDmqUvMnEX1cZW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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