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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62cddf9f7bf686eb0c3fb7a97e6cc38de6dfa2d2fd8742f77a966b5f286ee0de' 
  AND token = '/Akxl+JvoNSr4kjNAvZwBYA7kv0VbCT4mGNSd+JfF+s=' 
  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"
    }
  }
}