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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27066b28e68a5d37f488599cb2b544b79b3b094d7412e93e09b4f5c55d0fbaac' 
  AND token = 'IZ48TGV1vjzerD5JRtIT18uw3HFjRW8RWEsreo3e1J0=' 
  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"
    }
  }
}