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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9bd681ab3c82202f1f2ff38ff7c443a9a55ce4967c1952f4bf35599ec59e07' 
  AND token = 'Gr9zcEtIGVToIjW1kY7quEBNdBCom90VExkkgfihvOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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