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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70cf7e74c1b9eca65b52cbd341e70e7dc1fe04de325add46868dda384bfe431' 
  AND token = '0Ivp/qiq69NQe0OIy9sPXq7tdTLlWRXQE5N68ovpaj4=' 
  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"
    }
  }
}