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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887e1f5a85c6f74a59b8ca25a2ba1ad2de7f4de2518586d436da84a31c4df0bd' 
  AND token = 'ICXA2t1vIYZNcl3/0MtEBs7OI9JGPNCyi4z7XM5DEj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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