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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94dc27631eedbac4a601e234a64ae1326be176b0994698f330c184e15234d07b' 
  AND token = '8ZUTsbAx+kcbJ8uX3AEEs8BHRQwwr8DjncZOHF477BQ=' 
  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"
    }
  }
}