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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b92346a0f61c8028d09dc8db57fd034443433a1151de33bc607fff8840f84c' 
  AND token = 'QbPAtiop8kXsMWXzbEc7UrsYr15Y/gFCy99bA5F01LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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