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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9baa899dbbf41429580ad10d4efc3ea60fbc8ace933010ca5ae53bcb6077c79' 
  AND token = 'q4/PY/h5dQ7Ee66ljKEZrr66xGU6EZDY75Yk0nciJUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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