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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4c6a2882cc449799e7925dde926fcd6e409192e2b98a4a032f32a691943110' 
  AND token = 'jnYoXyYfZHqHR+y8Ssd7B7mnNzc9rJuSu8Fl1iMHI6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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