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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ff6ac332462512d143e1d96392e1b9a7dd00e3aca0bcb2236cbdcd42e7415e' 
  AND token = 'bpu8Z6ayGp0xBxDDHl5mRRCZm/e5FpTyBGPid3xY20E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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