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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8b95de84661ca4c17b46d1430a9f931f006f08dbbf6d0ced4b812c6246044e' 
  AND token = 'ghS/dglIdu5dgoUVJr3VZ7D+rma00ag0b+pO4jkoD8Y=' 
  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"
    }
  }
}