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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '161bc5df133a0b543ab5f0ecb45dcb42cfd951af2ffb32fb8918bc853f58c403' 
  AND token = 'OGLx5F6Im4FjKHll0dCHl4bT2nLts4XIWs+pNviZZvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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