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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b8119ff6b867aea176b2d57fb5e77ddb701985d5a96ca086ad17ec63bf12be' 
  AND token = 'BUZr5YpbrXLVChHm4pQZt6oq3GfKUYhbNLnjmx3Cnyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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