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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0d21164be3f9ef3fbfa1c887fadb8045ec881cee16d3722a9ff2835a457887' 
  AND token = 'EyOBQ6KF80DP5XvuvTdYQzJVNEjE57U7lg6yNovH3G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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