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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e5705dcf9b397d9e8072bd29c05f83c7ebee54740a4a1f068ce14180d284ed' 
  AND token = 'IjQbb+ECDKPvxLDZ1EmbVzCJvhk5Vth/tXTxnMT3Az4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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