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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e59cffa192b396e73014b91d2152e0e767bf92d9fd58be4d2c80b3b93dc53d3' 
  AND token = 'V48ucyhWWlcL5B+NKul03KTeBipK8m3y+WyaCH+nOk0=' 
  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"
    }
  }
}