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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615203ad8fded13e5e45a9d8dd5b3ae7e638eec35858714851e9a5dc324f7c91' 
  AND token = 'ChBRZd2Xq7sN1NEzF1lk4UaaXkH8k4AFq2XZ0Va1icQ=' 
  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"
    }
  }
}