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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01201a8a20915e7daf5f76d6bf628e6b55558f6cbc1a608759e3e47df9b79bd0' 
  AND token = '+cVbEvhlN0pe5NvKUYOufIh9ba1+WOfX1Sgq/tuYdD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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