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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d8a8e79b7a8d5110931424b54d69832f294246e84c474987b77799a0da6704' 
  AND token = 'C8HeyP+Cr5ZvlGe8si947z3iQF3K8UcY/zVKRLHfP7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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