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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b09b076a2ab40c12d525e8fe539e5b0bb0fef736f4668907bc924d59780e55' 
  AND token = '+XKUYxoTBPn0YUqvwy5PyxyslLV1r3eFK58At1rzOAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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