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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57dd2c1f384f940085bc63a0054bbe3503e233d152c378889b0b335d4733a77e' 
  AND token = 'gLyEs4GCssArslYkB8d4V1L3S2XOR3gE/oFDNgTF/HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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