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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51aff311117ac62b5f69ebfb9100a0a03451758b2b991030dcd2ad877b5eb10d' 
  AND token = 'dT7sxUJ88JVs/sM+HRlGjIXabLfvodtF5K29VbBV7aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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