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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cea3e209d4c5a3a379df3e158b7f029794219340fd47acc671f1b0dde7f964c' 
  AND token = 'm6fM4pJVjr6EnUMbZGVkoc0Cz44I3/s909HjOJU6qGc=' 
  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"
    }
  }
}