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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a81fac526c19b891f69621875c107bd4e563ee14a21296d5314d5c3e623806f3' 
  AND token = 'gxebWxSD698I5B+9+/tj8JjoiHY3eq7u2rsaBPgXanY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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