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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff6673ba9d3a1c9b61a4feca4d2c13ddc2c5ae8a2f0a2bbc32c44e43a65bd325' 
  AND token = 'zy8sPjCI6SfNTZi/qqzcotwSrq3aE7QEEm46ZxeC3NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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