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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7192aa11b9f6ad918dc896943b648b0a66b0b6f5e4f187f254093960380c09c5' 
  AND token = '4EvDipSPCKc+uJCY8Ss6D2WjTd1oB+zgD5NIQ72FgEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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