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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a811d9ac1ed1b382e4edb77f86bbd8d0a4ea9a58fa1b3104babaa592b06d9a3' 
  AND token = 'vxIG0l+awxOmyOwo1QUU1F3QZa1Dz7zMH49hYc3+KWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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