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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe50ea2745437eec0a1d991955abb7ec522db019264fb516a7696c2710ffa23' 
  AND token = 'dO+vYVh/sG5vj6ck/E3YkRU8xBV/BSzL16elGaT9MD8=' 
  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"
    }
  }
}