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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d92b66a1b6de09abfd83e601b4bf9ffcef253059c1b57b57b0e2ab987775d9' 
  AND token = 'XEEEsrvgfojbWWCywLhY48PbWA5YxtBN0hIW3XxZxiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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