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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d61037e172a7074d8fb223ec8b0a2ce905af9dd647c7db443fe7e8d45189640' 
  AND token = 'pxNnsoH40AvHZ7O3+2rFwpu4VOSU65bVEHj2yhWEkdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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