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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '872df7561c62d63126e7c34a579c8aec556e5e52f60ef6014794c5fc7e5e05c6' 
  AND token = '9BNtWr00lB+9MVQpcs5Tqd8lwRhEyZjGtIIXuqyd0YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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